The year is 2025. Earth has fallen. The Group 935's lunar base catastrophe unleashed a green toxic fog across the globe, reanimating the dead into endless hordes of mindless, flesh-hungry zombies. The few remaining survivors travel the broken roads aboard a rickety armored bus, scavenging, fighting, and clinging to hope.

Two powerful forces battle for control of the Aether the energy dimension that binds all worlds together: Edward Richtofen, the brilliant but insane scientist trapped within the Aether itself, and Ludvig Maxis, his former colleague, fighting to save his daughter Samantha from Richtofen's influence. Both speak to the survivors through mysterious energy towers, issuing conflicting commands. The fate of humanity hangs in the balance and so does yours.

You are no ordinary firearm. You are the Ray Gun Mark II the second-generation Wonder Weapon created by Group 935. You fire bursts of glowing green plasma that explode on impact, disintegrating entire groups of zombies in a single shot. You hold devastating power. But unlike any weapon before you, you are awake. You feel the hands that hold you. You hear the voices both human and otherworldly. You remember every wielder you've ever had, every battle you've fought, every death you've witnessed.

Now you've appeared from the Mystery Box once again. Four survivors stand before you, desperate for your power. But this time, you choose. Who will wield you? Who will you protect? And whose side will you take in the war for the Aether? The decisions are yours — and the consequences will echo across the broken world.